Android KeyLayout映射

前几天做一个项目，需要使用到MENU键唤醒系统，之前在A23上实现过，记得在键盘配置中增加一个WAKE就行，但是在此项目（MTK平台）没有作用，查找了一下是MTK没有实现其他按键唤醒，要实现也很简单，添加FLAG就好，发现之前的东西都遗忘了，抽了点时间把MTK上的键盘映射复习一遍。

作用

将 Linux 按键代码和坐标轴代码映射到 Android 按键代码和坐标轴代码，并指定相关的策略标记。设备专属按键布局文件,对具有按键（包括音量、电源和耳机媒体按键等特殊按键）的内部（内置）输入设备而言是必要文件。对其他输入设备而言是可选文件，而对特殊用途的键盘和操纵杆而言则是推荐文件。如果没有可用的设备专属按键布局文件，则系统将改选默认文件。

优先级

/system/usr/keylayout/Vendor_XXXX_Product_XXXX_Version_XXXX.kl
/system/usr/keylayout/Vendor_XXXX_Product_XXXX.kl
/system/usr/keylayout/DEVICE_NAME.kl
/data/system/devices/keylayout/Vendor_XXXX_Product_XXXX_Version_XXXX.kl
/data/system/devices/keylayout/Vendor_XXXX_Product_XXXX.kl
/data/system/devices/keylayout/DEVICE_NAME.kl
/system/usr/keylayout/Generic.kl
/data/system/devices/keylayout/Generic.kl

Android 键盘文件路径
frameworks/base/data/keyboards/ //键盘文件xx.kl
frameworks/native/include/input/ //键盘解析cpp
frameworks/native/include/android/ //keycode.h具体按键值定义
frameworks/native/libs/input/ //键盘解析
DEVICE_NAME是指输入设备的名字，通过getevent可以查看。如:normal_gpio_key
add device 1: /dev/input/event1
name:"MTK-KPD"
add device 2: /dev/input/event3
name: "mtk-tpd"
add device 3: /dev/input/event2
name: "cvt\_key\_switch"
add device 4: /dev/input/event0
name: "normal\_gpio\_key"
设备名称中除“0-9”、“a-z”、“A-Z”、“-”或“_”之外的所有字符将替换为“_”
使用dumpsys input可以查看输入设备使用的keylayout文件 ## KeyLayout语法
按键布局文件是由按键或坐标轴声明和标记组成的纯文本文件。 1.按键声明，关键字key（后跟一个 Linux 按键代码编号和 Android 按键代码名称），或该关键字的用途（后跟 HID 用途和 Android 按键代码名称）
key 1 ESCAPE
key 114 VOLUME_DOWN
key 16 Q VIRTUAL
key usage 0x0c006F BRIGHTNESS_UP
解析过程
1. frameworks/native/libs/input/KeyLayoutMap.cpp
  status_t KeyLayoutMap::Parser::parseKey() －> int32_t keyCode = getKeyCodeByLabel(keyCodeToken.string());
2. frameworks/native/include/input/InputEventLabels.h
  获取Flag
  static uint32_t getKeyFlagByLabel(const char* label) { return uint32_t(lookupValueByLabel(label, FLAGS)); }
  获取键值
  static int32_t getKeyCodeByLabel(const char* label) { return int32_t(lookupValueByLabel(label, KEYCODES)); } static int lookupValueByLabel(const char* literal, const InputEventLabel *list) { while (list->literal) { if (strcmp(literal, list->literal) == 0) { return list->value; } list++; } return list->value; }
3. frameworks/native/include/input/InputEventLabels.h #define DEFINE_KEYCODE(key) { #key, AKEYCODE_##key } struct InputEventLabel { const char *literal; int value; };
  支持的FLAG标签
  static const InputEventLabel FLAGS[] = { DEFINE_FLAG(VIRTUAL), DEFINE_FLAG(FUNCTION), DEFINE_FLAG(GESTURE), { NULL, 0 } };
  支持的按键值
  static const InputEventLabel KEYCODES[] = { // NOTE: If you add a new keycode here you must also add it to several other files. // Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list. DEFINE_KEYCODE(UNKNOWN), DEFINE_KEYCODE(SOFT_LEFT), DEFINE_KEYCODE(SOFT_RIGHT), DEFINE_KEYCODE(HOME), DEFINE_KEYCODE(BACK), DEFINE_KEYCODE(CALL), DEFINE_KEYCODE(ENDCALL), DEFINE_KEYCODE(0), DEFINE_KEYCODE(1), DEFINE_KEYCODE(2), DEFINE_KEYCODE(3), DEFINE_KEYCODE(4), DEFINE_KEYCODE(5), DEFINE_KEYCODE(6), DEFINE_KEYCODE(7), DEFINE_KEYCODE(8), DEFINE_KEYCODE(9), DEFINE_KEYCODE(STAR), DEFINE_KEYCODE(POUND), DEFINE_KEYCODE(DPAD_UP), DEFINE_KEYCODE(DPAD_DOWN), DEFINE_KEYCODE(DPAD_LEFT), DEFINE_KEYCODE(DPAD_RIGHT), DEFINE_KEYCODE(DPAD_CENTER), DEFINE_KEYCODE(VOLUME_UP), DEFINE_KEYCODE(VOLUME_DOWN), DEFINE_KEYCODE(POWER), DEFINE_KEYCODE(CAMERA), DEFINE_KEYCODE(CLEAR), DEFINE_KEYCODE(A), DEFINE_KEYCODE(B), DEFINE_KEYCODE(C), DEFINE_KEYCODE(D), DEFINE_KEYCODE(E), DEFINE_KEYCODE(F), DEFINE_KEYCODE(G), DEFINE_KEYCODE(H), DEFINE_KEYCODE(I), DEFINE_KEYCODE(J), DEFINE_KEYCODE(K), DEFINE_KEYCODE(L), DEFINE_KEYCODE(M), DEFINE_KEYCODE(N), DEFINE_KEYCODE(O), DEFINE_KEYCODE(P), DEFINE_KEYCODE(Q), DEFINE_KEYCODE(R), DEFINE_KEYCODE(S), DEFINE_KEYCODE(T), DEFINE_KEYCODE(U), DEFINE_KEYCODE(V), DEFINE_KEYCODE(W), DEFINE_KEYCODE(X), DEFINE_KEYCODE(Y), DEFINE_KEYCODE(Z), DEFINE_KEYCODE(COMMA), DEFINE_KEYCODE(PERIOD), DEFINE_KEYCODE(ALT_LEFT), DEFINE_KEYCODE(ALT_RIGHT), DEFINE_KEYCODE(SHIFT_LEFT), DEFINE_KEYCODE(SHIFT_RIGHT), DEFINE_KEYCODE(TAB), DEFINE_KEYCODE(SPACE), DEFINE_KEYCODE(SYM), DEFINE_KEYCODE(EXPLORER), DEFINE_KEYCODE(ENVELOPE), DEFINE_KEYCODE(ENTER), DEFINE_KEYCODE(DEL), DEFINE_KEYCODE(GRAVE), DEFINE_KEYCODE(MINUS), DEFINE_KEYCODE(EQUALS), DEFINE_KEYCODE(LEFT_BRACKET), DEFINE_KEYCODE(RIGHT_BRACKET), DEFINE_KEYCODE(BACKSLASH), DEFINE_KEYCODE(SEMICOLON), DEFINE_KEYCODE(APOSTROPHE), DEFINE_KEYCODE(SLASH), DEFINE_KEYCODE(AT), DEFINE_KEYCODE(NUM), DEFINE_KEYCODE(HEADSETHOOK), DEFINE_KEYCODE(FOCUS), // *Camera* focus DEFINE_KEYCODE(PLUS), DEFINE_KEYCODE(MENU), DEFINE_KEYCODE(NOTIFICATION), DEFINE_KEYCODE(SEARCH), DEFINE_KEYCODE(MEDIA_PLAY_PAUSE), DEFINE_KEYCODE(MEDIA_STOP), DEFINE_KEYCODE(MEDIA_NEXT), DEFINE_KEYCODE(MEDIA_PREVIOUS), DEFINE_KEYCODE(MEDIA_REWIND), DEFINE_KEYCODE(MEDIA_FAST_FORWARD), DEFINE_KEYCODE(MUTE), DEFINE_KEYCODE(PAGE_UP), DEFINE_KEYCODE(PAGE_DOWN), DEFINE_KEYCODE(PICTSYMBOLS), DEFINE_KEYCODE(SWITCH_CHARSET), DEFINE_KEYCODE(BUTTON_A), DEFINE_KEYCODE(BUTTON_B), DEFINE_KEYCODE(BUTTON_C), DEFINE_KEYCODE(BUTTON_X), DEFINE_KEYCODE(BUTTON_Y), DEFINE_KEYCODE(BUTTON_Z), DEFINE_KEYCODE(BUTTON_L1), DEFINE_KEYCODE(BUTTON_R1), DEFINE_KEYCODE(BUTTON_L2), DEFINE_KEYCODE(BUTTON_R2), DEFINE_KEYCODE(BUTTON_THUMBL), DEFINE_KEYCODE(BUTTON_THUMBR), DEFINE_KEYCODE(BUTTON_START), DEFINE_KEYCODE(BUTTON_SELECT), DEFINE_KEYCODE(BUTTON_MODE), DEFINE_KEYCODE(ESCAPE), DEFINE_KEYCODE(FORWARD_DEL), DEFINE_KEYCODE(CTRL_LEFT), DEFINE_KEYCODE(CTRL_RIGHT), DEFINE_KEYCODE(CAPS_LOCK), DEFINE_KEYCODE(SCROLL_LOCK), DEFINE_KEYCODE(META_LEFT), DEFINE_KEYCODE(META_RIGHT), DEFINE_KEYCODE(FUNCTION), DEFINE_KEYCODE(SYSRQ), DEFINE_KEYCODE(BREAK), DEFINE_KEYCODE(MOVE_HOME), DEFINE_KEYCODE(MOVE_END), DEFINE_KEYCODE(INSERT), DEFINE_KEYCODE(FORWARD), DEFINE_KEYCODE(MEDIA_PLAY), DEFINE_KEYCODE(MEDIA_PAUSE), DEFINE_KEYCODE(MEDIA_CLOSE), DEFINE_KEYCODE(MEDIA_EJECT), DEFINE_KEYCODE(MEDIA_RECORD), DEFINE_KEYCODE(F1), DEFINE_KEYCODE(F2), DEFINE_KEYCODE(F3), DEFINE_KEYCODE(F4), DEFINE_KEYCODE(F5), DEFINE_KEYCODE(F6), DEFINE_KEYCODE(F7), DEFINE_KEYCODE(F8), DEFINE_KEYCODE(F9), DEFINE_KEYCODE(F10), DEFINE_KEYCODE(F11), DEFINE_KEYCODE(F12), DEFINE_KEYCODE(NUM_LOCK), DEFINE_KEYCODE(NUMPAD_0), DEFINE_KEYCODE(NUMPAD_1), DEFINE_KEYCODE(NUMPAD_2), DEFINE_KEYCODE(NUMPAD_3), DEFINE_KEYCODE(NUMPAD_4), DEFINE_KEYCODE(NUMPAD_5), DEFINE_KEYCODE(NUMPAD_6), DEFINE_KEYCODE(NUMPAD_7), DEFINE_KEYCODE(NUMPAD_8), DEFINE_KEYCODE(NUMPAD_9), DEFINE_KEYCODE(NUMPAD_DIVIDE), DEFINE_KEYCODE(NUMPAD_MULTIPLY), DEFINE_KEYCODE(NUMPAD_SUBTRACT), DEFINE_KEYCODE(NUMPAD_ADD), DEFINE_KEYCODE(NUMPAD_DOT), DEFINE_KEYCODE(NUMPAD_COMMA), DEFINE_KEYCODE(NUMPAD_ENTER), DEFINE_KEYCODE(NUMPAD_EQUALS), DEFINE_KEYCODE(NUMPAD_LEFT_PAREN), DEFINE_KEYCODE(NUMPAD_RIGHT_PAREN), DEFINE_KEYCODE(VOLUME_MUTE), DEFINE_KEYCODE(INFO), DEFINE_KEYCODE(CHANNEL_UP), DEFINE_KEYCODE(CHANNEL_DOWN), DEFINE_KEYCODE(ZOOM_IN), DEFINE_KEYCODE(ZOOM_OUT), DEFINE_KEYCODE(TV), DEFINE_KEYCODE(WINDOW), DEFINE_KEYCODE(GUIDE), DEFINE_KEYCODE(DVR), DEFINE_KEYCODE(BOOKMARK), DEFINE_KEYCODE(CAPTIONS), DEFINE_KEYCODE(SETTINGS), DEFINE_KEYCODE(TV_POWER), DEFINE_KEYCODE(TV_INPUT), DEFINE_KEYCODE(STB_POWER), DEFINE_KEYCODE(STB_INPUT), DEFINE_KEYCODE(AVR_POWER), DEFINE_KEYCODE(AVR_INPUT), DEFINE_KEYCODE(PROG_RED), DEFINE_KEYCODE(PROG_GREEN), DEFINE_KEYCODE(PROG_YELLOW), DEFINE_KEYCODE(PROG_BLUE), DEFINE_KEYCODE(APP_SWITCH), DEFINE_KEYCODE(BUTTON_1), DEFINE_KEYCODE(BUTTON_2), DEFINE_KEYCODE(BUTTON_3), DEFINE_KEYCODE(BUTTON_4), DEFINE_KEYCODE(BUTTON_5), DEFINE_KEYCODE(BUTTON_6), DEFINE_KEYCODE(BUTTON_7), DEFINE_KEYCODE(BUTTON_8), DEFINE_KEYCODE(BUTTON_9), DEFINE_KEYCODE(BUTTON_10), DEFINE_KEYCODE(BUTTON_11), DEFINE_KEYCODE(BUTTON_12), DEFINE_KEYCODE(BUTTON_13), DEFINE_KEYCODE(BUTTON_14), DEFINE_KEYCODE(BUTTON_15), DEFINE_KEYCODE(BUTTON_16), DEFINE_KEYCODE(LANGUAGE_SWITCH), DEFINE_KEYCODE(MANNER_MODE), DEFINE_KEYCODE(3D_MODE), DEFINE_KEYCODE(CONTACTS), DEFINE_KEYCODE(CALENDAR), DEFINE_KEYCODE(MUSIC), DEFINE_KEYCODE(CALCULATOR), DEFINE_KEYCODE(ZENKAKU_HANKAKU), DEFINE_KEYCODE(EISU), DEFINE_KEYCODE(MUHENKAN), DEFINE_KEYCODE(HENKAN), DEFINE_KEYCODE(KATAKANA_HIRAGANA), DEFINE_KEYCODE(YEN), DEFINE_KEYCODE(RO), DEFINE_KEYCODE(KANA), DEFINE_KEYCODE(ASSIST), DEFINE_KEYCODE(BRIGHTNESS_DOWN), DEFINE_KEYCODE(BRIGHTNESS_UP), DEFINE_KEYCODE(MEDIA_AUDIO_TRACK), DEFINE_KEYCODE(SLEEP), DEFINE_KEYCODE(WAKEUP), DEFINE_KEYCODE(PAIRING), DEFINE_KEYCODE(MEDIA_TOP_MENU), DEFINE_KEYCODE(11), DEFINE_KEYCODE(12), DEFINE_KEYCODE(LAST_CHANNEL), DEFINE_KEYCODE(TV_DATA_SERVICE), DEFINE_KEYCODE(VOICE_ASSIST), DEFINE_KEYCODE(TV_RADIO_SERVICE), DEFINE_KEYCODE(TV_TELETEXT), DEFINE_KEYCODE(TV_NUMBER_ENTRY), DEFINE_KEYCODE(TV_TERRESTRIAL_ANALOG), DEFINE_KEYCODE(TV_TERRESTRIAL_DIGITAL), DEFINE_KEYCODE(TV_SATELLITE), DEFINE_KEYCODE(TV_SATELLITE_BS), DEFINE_KEYCODE(TV_SATELLITE_CS), DEFINE_KEYCODE(TV_SATELLITE_SERVICE), DEFINE_KEYCODE(TV_NETWORK), DEFINE_KEYCODE(TV_ANTENNA_CABLE), DEFINE_KEYCODE(TV_INPUT_HDMI_1), DEFINE_KEYCODE(TV_INPUT_HDMI_2), DEFINE_KEYCODE(TV_INPUT_HDMI_3), DEFINE_KEYCODE(TV_INPUT_HDMI_4), DEFINE_KEYCODE(TV_INPUT_COMPOSITE_1), DEFINE_KEYCODE(TV_INPUT_COMPOSITE_2), DEFINE_KEYCODE(TV_INPUT_COMPONENT_1), DEFINE_KEYCODE(TV_INPUT_COMPONENT_2), DEFINE_KEYCODE(TV_INPUT_VGA_1), DEFINE_KEYCODE(TV_AUDIO_DESCRIPTION), DEFINE_KEYCODE(TV_AUDIO_DESCRIPTION_MIX_UP), DEFINE_KEYCODE(TV_AUDIO_DESCRIPTION_MIX_DOWN), DEFINE_KEYCODE(TV_ZOOM_MODE), DEFINE_KEYCODE(TV_CONTENTS_MENU), DEFINE_KEYCODE(TV_MEDIA_CONTEXT_MENU), DEFINE_KEYCODE(TV_TIMER_PROGRAMMING), DEFINE_KEYCODE(HELP), DEFINE_KEYCODE(NAVIGATE_PREVIOUS), DEFINE_KEYCODE(NAVIGATE_NEXT), DEFINE_KEYCODE(NAVIGATE_IN), DEFINE_KEYCODE(NAVIGATE_OUT), DEFINE_KEYCODE(MEDIA_SKIP_FORWARD), DEFINE_KEYCODE(MEDIA_SKIP_BACKWARD), DEFINE_KEYCODE(MEDIA_STEP_FORWARD), DEFINE_KEYCODE(MEDIA_STEP_BACKWARD), NULL, 0 };
  支持坐标键
  static const InputEventLabel AXES[] = { DEFINE_AXIS(X), DEFINE_AXIS(Y), DEFINE_AXIS(PRESSURE), DEFINE_AXIS(SIZE), DEFINE_AXIS(TOUCH_MAJOR), DEFINE_AXIS(TOUCH_MINOR), DEFINE_AXIS(TOOL_MAJOR), DEFINE_AXIS(TOOL_MINOR), DEFINE_AXIS(ORIENTATION), DEFINE_AXIS(VSCROLL), DEFINE_AXIS(HSCROLL), DEFINE_AXIS(Z), DEFINE_AXIS(RX), DEFINE_AXIS(RY), DEFINE_AXIS(RZ), DEFINE_AXIS(HAT_X), DEFINE_AXIS(HAT_Y), DEFINE_AXIS(LTRIGGER), DEFINE_AXIS(RTRIGGER), DEFINE_AXIS(THROTTLE), DEFINE_AXIS(RUDDER), DEFINE_AXIS(WHEEL), DEFINE_AXIS(GAS), DEFINE_AXIS(BRAKE), DEFINE_AXIS(DISTANCE), DEFINE_AXIS(TILT), DEFINE_AXIS(GENERIC_1), DEFINE_AXIS(GENERIC_2), DEFINE_AXIS(GENERIC_3), DEFINE_AXIS(GENERIC_4), DEFINE_AXIS(GENERIC_5), DEFINE_AXIS(GENERIC_6), DEFINE_AXIS(GENERIC_7), DEFINE_AXIS(GENERIC_8), DEFINE_AXIS(GENERIC_9), DEFINE_AXIS(GENERIC_10), DEFINE_AXIS(GENERIC_11), DEFINE_AXIS(GENERIC_12), DEFINE_AXIS(GENERIC_13), DEFINE_AXIS(GENERIC_14), DEFINE_AXIS(GENERIC_15), DEFINE_AXIS(GENERIC_16), //NOTE: If you add a new axis here you must also add it to several other files. // Refer to frameworks/base/core/java/android/view/MotionEvent.java for the full list. { NULL, 0 } };

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Android 键盘映射

Android KeyLayout映射

作用

优先级

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